$B_d-{\bar{B}}_d$ mixing vs. $B_s-{\bar{B}}_s$ mixing with the anomalous $Wtb$ couplings

Abstract

We explore the effects of the anomalous $tbW$ couplings on the $\bd$ mixing and recently measured $\bs$ mixing. The combined analysis of mixings via box diagrams with penguin decays provides strong constraints on the anomalous top quark couplings. We find the bound from the $\bd$ mixing data is stronger than that from the $\bs$ mixing.

6 pages, 2 figures